diff --git a/module.h b/module.h
index 268bd15b..368c4411 100644
--- a/module.h
+++ b/module.h
@@ -15,8 +15,6 @@
 
 namespace py {
 
-class ExtensionType;
-
 class Module
 {
     typedef PyObject * (*RawFunctionPtr)(py::Tuple const &, py::Dict const &);